Drill jar



Oct. 11, 1932. J. N. KAUMANS ET AL.

DRILL JAR Inventor;

cf. /i/. Kaumkm; E fimidf Filed July 11, 19:51

Patented Oct. 11, 1932 warren srA'rns DRILL m V Application filed July 11,

The present invention relates generally to well drilling apparatus and more particularly to new and useful improvements 1n drill jars and has for its primary object to L3 provide, in a manner as hereinafter set forth,

a device of this character embodying a novel construction, combination and arrangement of parts whereby loss of the bit will be prevented should the jar links or members be to broken.

'(lther objects of the invention are to provide a drill jar of the character described which will be simple in construction, strong, durable, efficient and reliable in use and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein Figure l is a view in side elevation of a drill jar in accordance with this invention showing the bit mounted thereon.

Figure 2 is a view showing the drill jar in vertical section.

Figure 3 is a view of the drill jar with the barrel or casing removed.

Figure l is a view partially in vertical sec tion and partially in side elevation of the upper portion of the drill jar with the barrel or casing removed'therefrom.

Figure 5 is a detail view in vertical section through the cable coupling socket.

Figure 6 is a view in horizontal cross section taken substantially on the line 6-6 of Fig- 46 me looking downwardly, as indicated by the arrows.

Figure 7 is a detail view in top plan of the cable coupling socket.

Referring now to the drawing in detail, it

s will be seen that the reference numeral 1 design a drill rod having threadedly mounted on its lower end the bit 2, said bit being threadedly coupled to the rod 1, as at 3.

Integral with the upper end of the drlll rod 59 l is a lower jar member l which includes a 1931. se al n 550,242.

threaded portion upper portionfi. I v J, p

The reference numeral 7 designates. the uppcrj member including adepending slotted portion'or'lo'op 8 which is slidably connected with the-slottedportion ,6 of the lower jar member 4. r i

T is upper jar member 7 further includes a tapered polygonal portion "9for engagement by a suitable tool such as a wrench, above which is dispost-nl a cylindrical head 10. A threaded shank 17 extends upwardly from the head 10 of the upper jar member and threadedly' mounted thereon is a tapered socket memberll in which one end portion of the drill cable 12 is inserted and anchored in any suitable manner, as at 13.

The reference numeral 14 designates an" elongated barrel or casing having its lower end portion internally threaded and screwed on the portion- 5 of. the lower jar member 4, illustrated to advantage in Figure 2 of I the drawin s The barrelbr casing 14 611-, closes the jar members andthe' cable socket 1 1, as well as the lower end-portion of the cable. At its upper end the barrel or casing 141- terminates in a reduced neck 15 which provides means forpermitting a suitable fishing 'or grappling tool to'gain a hold should the cable 12 break. In addition, the neck 15S and. a vertically slotted prevents an excessive amount-of'dirt, rock.

and other matter from entering the barrel or casing through the upper end thereof and said neck still furth'erprevents excessive lateral movement of the upper end of the barrel or casingrelative to the cable.

In its lowerportions the barrel or casing 14 is provided with a plurality of openings 16 to permit a suitable actuating tool to be operatively engaged therewith and also to permit the escape of foreign matter which may get into the barrel or casing.

Should either of the jar members break or should the socket member 11 be separated therefrom, the tool will not be detached from the cable for the reason that the socket memher cannot pass upwardly through the barrel 7 or casing 14 beyond the neck 15 and it will thus be seen that the tool may be withdrawn from the hole. Then, as before stated, should 1 the cable '12 break, a suitablegrappling tool maybe lowered into the well and engaged with the reduced neck 15. The, threaded p shank by which the socket member 11 is conneoted to theupper jar member? is designated by the reference numeral; 17 in Figure l of the drawing. e V- I It is believed that the many advantages of a drill jar in accordance with the present in- 'vention will'abe,readily-understood, and,although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details of construction and in the combinationand arrangement of parts may be resorted to which will fall within the scope ofthe'invention asclaimed. 7 What s claimed 1s 29 A drill jar. comprising a bit, alower jar member threadedly connected with the upper end of the bit and including a threaded intermediate, portion and further includinga slotted upper portion, an upper jarmember I includingfarldepending, slotted portion slidably interlooped with thegslotted portionv of the lower jar member for operatively connecting said jar members together, the upper'jar member {further including ahead and a :threaded shankextendingupwardly from the head, a socket. member .threadedly engaged with the shank and constituting means for tunes 7 a a r JOHN.-N'. KAUMANS. ELISHA BRIDGES.

connecting the drill cable to: the upper jar by i I i upper and lower jar members become sep- In testimony whereof we aflixour signa- 

